Glacial Chasm + Conduit of Worlds + Wayward Swordtooth

Glacial Chasm

Conduit of Worlds

Wayward Swordtooth

How it works

1. Play Glacial Chasm either from your hand or from your graveyard.
2. When Glacial Chasm enters the battlefield, its second ability triggers, causing you to sacrifice another land you control.
3. Play any land from your graveyard.
4. At the beginning of your next upkeep, Glacial Chasm's cumulative upkeep ability triggers, allowing you to choose not to pay the cost and sacrifice it instead.
5. Repeat.

This lockdown engine uses Glacial Chasm to completely insulate you from all damage, sidestepping its punishing cumulative upkeep by simply sacrificing it and looping it right back. Wayward Swordtooth provides the extra land drop necessary to get your lands back into play each turn, while Conduit of Worlds sits safely on your board allowing you to replay Glacial Chasm directly from your graveyard over and over again. Every time Glacial Chasm re-enters, its sacrifice trigger eats a disposable land that you can easily recur or replace, maintaining total immunity without ever letting the cumulative upkeep catch up to you.